CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury
Beginning balance, shares at Mar. 31, 2018		14,703,084				(5,583,338)
Beginning balance at Mar. 31, 2018	$ 253,695	$ 1,470	$ 58,877	$ 339,088	$ 1,163	$ (146,903)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	471		471
Cash dividends ($.20 per common share)	(1,827)			(1,827)
Other comprehensive income (loss)	(455)				(455)
Net income (loss)	(18,476)			(18,476)
Ending balance at Jun. 30, 2018	233,408	$ 1,470	59,348	318,785	708	$ (146,903)
Ending balance, shares at Jun. 30, 2018		14,703,084				(5,583,338)
Beginning balance, shares at Mar. 31, 2019		14,703,084				(5,865,846)
Beginning balance at Mar. 31, 2019	189,931	$ 1,470	60,921	277,613	465	$ (150,538)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	73		73
Issuance of common stock under equity plan	(42)			(782)		$ 740
Issuance of common stock under equity plan, shares						15,611
Other comprehensive income (loss)	(215)				(215)
Net income (loss)	(14,248)			(14,248)
Ending balance at Jun. 30, 2019	$ 175,499	$ 1,470	$ 60,994	$ 262,583	$ 250	$ (149,798)
Ending balance, shares at Jun. 30, 2019		14,703,084				(5,850,235)